This affidavit documents the cohabitation of two individuals for over ten years without being legally married. What is Cohabitation?Generally speaking, unmarried cohabitants are two unmarried people, in a relationship, who are living together. The two partners must prepare a "Declaration of Domestic Partnership" to be filed with the. Register of Wills in the jurisdiction in which they reside. An Affidavit of Cohabitation is used if a couple wants to prove that they are living together as spouses for a certain period. The purpose of this affidavit is to attest to the truth of their unmarried cohabitation for legal purposes. We are executing this affidavit to attest to the foregoing facts and for the purposes of contracting marriage without the need of securing the marriage license. I am an overseas Filipino worker (OFW) seeking your advice on the legal process for filing an affidavit of cohabitation. NON-RESIDENT MARRIAGE LICENSE APPLICATION - AFFIDAVIT.